Fuel tank ventilation in Vectra
There is a vented intake/exhaust reservoir on the filler pipe above the fuel tank. Two hose pipelines are connected to the tank. Through the upper exhaust hose, air exits the fuel tank when gasoline is poured into it. This is the so-called accelerated ventilation.
A second, thinner vent hose discharges constantly generated fuel vapors. In addition, air is supplied to the fuel tank through this hose during driving in accordance with the consumption of gasoline, so that underpressure cannot form in the tank.
Activated carbon filter system
In our vehicles with a catalytic converter, the inlet/exhaust pipe is not only led out, but into the activated charcoal reservoir in front in the right wheel arch. The purpose of such a device is to capture environmentally harmful fuel vapors coming from a ventilation tank (formed as a result of heating the contents of the fuel tank).
When the engine is running and under a certain load on the engine, the gases are again sucked out of the activated charcoal tank. When this should occur is determined by the fuel tank vent solenoid valve set by the ignition/injection control unit.
The activated charcoal tank is located in the front right fender. The numbers indicate:
1 - a tank with activated carbon;
2 - ventilation tube;
3 - drainage pipeline;
4 - vent tube of the fuel tank.
When the engine is running, fuel vapor is sucked out of the activated charcoal tank. This is done by means of a solenoid vent valve (arrow). The photo on the left shows the vent valve in a car with a 1.6 liter 8-valve engine. The photo on the right shows a vent valve in a car with a 16V 1.6L engine.
Fuel flow block
In the filler neck there is a device for blocking the flow of fuel. This device is a gravity valve. It closes the pipeline if the lateral inclination of the vehicle exceeds 45°. In this way, the leakage of fuel through the ventilation and exhaust pipelines in case of accidents should be prevented. Fuel leakage blockage is checked as follows:
- Disconnect the gravity valve from the fuel tank, put on a suitable auxiliary hose.
- If the car is level and you are now blowing through the hose, no effort is needed.
Fuel drain
If it is necessary to drain gasoline to carry out work on the fuel system, then try to empty the tank as much as possible during the trip. Then drain the remaining fuel in the tank as described below:
- Place a container of sufficient size under the escaping fuel
- Insert the hose as far as possible into the filler neck.
- Cover the top hole of the hose tightly with your finger. Pull the hose out a little again and lower it into the container as low as possible.
- If the hose was lowered deep enough into the gasoline, then the gasoline will now flow due to the height difference.
- Never suck gasoline with your mouth!
Removing the fuel tank
Thoroughly wash the bottom of the vehicle first so that dirt cannot enter the fuel system during installation.
Disconnect the battery ground wire.
Drain fuel.
Where possible, depressurize the lines through the test connection on the fuel distribution line.
Open the fuel tank flap. Unscrew the fuel tank cap and remove the sealing ring on the filler neck of the tank.
Unscrew the fixing bolt located under it.
Inside the car, fold back the rear seat and press out the mounting hole on the bottom of the car.
Disconnect the multi-pin connector on the lock cover.
Mark the fuel lines, unlock the quick-release fasteners and remove from the cap.
Support the car and remove the right wheel.
Remove the fender liner see body chapter.
Mark the lines on the gravity valve and remove them.
Remove the fuel tank filler neck.
Remove the exhaust system to the catalytic converter.
Release and disconnect the fuel lines at the bottom of the quick-release closures.
Close the pipes and fuel filter with plugs and hang the fuel filter.
Support the fuel tank with a jack and boards, or have an assistant support it.
Unscrew the fixing bolt of the retaining tape from the right rear.
Unscrew the fixing bolts of the retaining bands.
Bend down the left retaining tape. Remove the right retaining tape.
Lower the fuel tank with a jack.
When installing, tighten the screws of the retaining straps to 20 Nm.
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